* Adds getblockheader RPC method
* Updates snapshots, adds hash/height/next_block_hash fields to verbose response
* updates getblock snapshot
* updates getblockheader response type to hex-encode fields, adds ToHex impl for sapling::tree::Root, adds snapshot and vector tests for new RPC method, adds snapshots.
* rustfmt
* fixes snapshots, matches zcashd more closely
* fixes vectors test
* updates lwd failure messages (probably doesn't matter, but seems better to handle it now than risk debugging it later)
* fixes getblock_rpc test, fixes/reverses finalsaplingroot field byte-order.
* fixes vector test, addresses remaining differences with zcashd (except the `chainwork` field), updates snapshots, and avoids a possible panic when there's a chain reorg between state queries.
* Adds a comment noting that the `relative_to_network()` method was copied from zcashd
* Apply suggestions from code review
Co-authored-by: Alfredo Garcia <oxarbitrage@gmail.com>
---------
Co-authored-by: Alfredo Garcia <oxarbitrage@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
1e46914131